Leveling drawing-table for combination jolt-ramming and rock-over machines.



W. C.INORCR0SS. mmm DRAWING man PoR COMBINATION IOLLRAMMING ANDRock-OVER MACHINESi APPLICATION FILED OCT. 2|; 1916.

Patented Novu 6, 1917.

2 SHEETS-SHEET I I *lI W. C. NORCROSS.

LEJTVW YJEAWHQG ABL'E FOD SOMBNATION lOLT-RAMMING ANDROCK-OVVER'MACHINES.

APPLICATION min 0m21.191s.

Patented Nov. 6, 191?.

2 sums-SHEET 2.

55% l ik w i is a specification.,v

'Unia-n WILLIAM c. Nonciaoss, V0F 'rn'nnn HAUTE, INDIANA. y

'LnlvnIzI'NG niiawINs-TABLE ron COMBINATION Joi.Ti .AMMIi\iGVANnRooK-ovni 'If To all whom t may concern.' y' j', y f Be it known thatIJVILLIAMG NORCRoss, a citizen of theUnitedv States, residing at TerreVHaute, county of vigmand'state'of Indiana,`have invented'cert'ain newand useful Improvements" in Leveling Drawing- Tables for CombinationJolt-Ramming and Rock-Over Machines, of which the following Y Thisinvention'relates to leveling drawing tables for' combinationjolt-ramming and rock-over machines and is an improvement on theleveling 'drawing table set forth'lin iny Patents No. 1224407, dated May1, 1917 and No. 1231187 dated J une 26, -`1917 Machines' of the generalclass towliich my invention belongs embody an automatic joltrammingmachine,` vand drawing cylinder having a table to support 7the mold asit is lowered away yfrom the pattern, 'rock-over means being used totiltthe rammed'flask, mold, pattern, and attachments to a position where themold may be lowered away from the pattern. 1 i l Y.

In this class of machines, itis important to provide asuitably level andfirm bearing or support for the mold while it is being drawn from theflask'and pattern for, unless supported perfectly level, there `will bea tendencyto distort the moldas itwill not draw clear from the patternwithoutrelative lateral movement.l f i j j" In my patents-aforesaid Ihave'sliown and l described `and in the latter of said patents haveclaimed, a novel leveling table or attachment for the drawing cylinderwhich is adapted to automatically adjust "itselffon elevation ofthepiston of the'drawingcylinder, by its contact withfthe bottom board orthe battens thereof, after, the rammed mold has beenrocked-over. Thatdrawing table'has improved'means whereby it "may be securely fastened inits set or adjusted position, such fastening being necessary inasmuch asthe table is pivotally or oscillatorily supported in the region of itscentral portion.

The object of the present invention is the provision of an improvedleveling drawing table which upon adjusting itself to inequalities ofthe bottom board or the battens thereof, is held in that position byfriction between itself and its supporting means caused by the weight ofthe mold resting s MACHINES.

. l `jspsciiicafion' f Letters raient.

upon saidftable, thus 4vobviatii'ig they y ratentednemc, i917;Appiieatiozifiieaoqtoberai,191e. seriaiiwiaamsn Y 1" of employingalocking `means f which re'- f quires attention-on the part oftheoperator.

The cost of manufacture ,and the-timersi quired to draw a moldare bothgreatly lessened 'byl my improvements while, at the same time Ithere isno possibility of the moldfbeing distorted. f f f My inventioncontemplates the provision of a leveling drawing tablewhic'h is tiltablymounted so that it "will conform tothe bottom board or'the'vbattensthereof and, when the Iii-old is. supported by the table,thezpr'essure or weight Vof the mold vwill cause the table to befrictionally'held'upon',its gup'pgrt without resort to Yany 'lockingd'evice-` f The table 'has a plurality of :supporting or bearingAsurfaces or devicesV on which the mold rests. Modifications mayberesorted to in'fthe manner of supporting or mounting the table."l`heAinvention may be otherwise changed. Consequently, I dofnot limit myselfto the precise construction `hereinafter described and shownffin theaccompanying' drawings assuch -construction is to be iconsidered asillustrative,- rathery thanjrestrictive, ofthe scope lofthe invention.

'Inthe accompanying drawings:I

1 Figure 1 isa Yside'elevation of the draivf ing table, certain partsbeing broken awayl;

Fig.v 2 a'plan view thereof; v Fig. 3 a side elevation,'partlyxfbrokenaway, of a modification, and" s f Fig. 4 a plan view'thereof."

Referring first ,toy Figs. 1 and. 2', 1 cylinder ofthe drawing tableandlQthe'piston working therein. Any suitable means may be provided forlifting the-piston as, for

is 'the instance, compressed air. The-'drawingtable may be elevated anddepressed mechanically fand the'cylinder dispensed "with',k "iffpre-I-ferred, in which event the raising and lowering means would be appliedto the support 2.

The upper end of the support 2 has a ball 3. The drawing table comprisesaplurality of sections 4 which have a plurality of bearing or supportingparts 5. The

mold, not shown, is adapted to rest upon the bearing parte 5 when thesupport 2 is elevated to bring the table against -the bottom board orthe battens thereof of the mold which has been rammed and rocked-over,0r otherwise positioned for drawing. The inner ends. ofthe sections 4have concavities 6 which embrace and bear upon the ball 3. 'Ihe uprightflanges 7 on the sections 4 are connected, above the ball 3, by a bolt 8whose heads or head and nut 9 and 10, bear upon the outer faces of saidflanges and are preferably rounded or formed to fit in correspondingconc'avities in the flanges as shown at 11. 'Ihe space 12 which existsbetween the flanges 7 enables the sections 4 to relatively move and tohave a gripping action on the ball 3 when pressure is applied to saidsections by the supporting of the mold thereby. The employment of theball and the concavities 6 enables the sections 4 to tilt and twist, ina universal 1nanner, so that when the support 2 is elevated and thebearing points or parts 5 engage the bottom board or battens on themold, the table will automatically conform to the p0- sition of themold. lllhen the support 2 is lowered, to draw the mold from thepattern, the weight of the mold acting on the parts 5 causes them toexert a leverage so that the faces of the concavities 6 bear firmly andfrictionally upon the 'ball and the table is thus automatically held, byfrictional engagement, to the support 2. No otherl locking means isemployed to hold the table in its adjusted position.

Referring to Figs. 3, 4, instead ofthe table being formed in a pluralityof sections, it is in a single integral or rigid piece 13 which hasarcshaped flanges 14 of suitable length, say 90, more or less. i Carriedby the piston 2 is a head 3 which is a truncated senii-sphere, orspherical section, of relatively large diameter, on which the concavesurfaces or edges 14a of the flanges 14 frictionally bear. Being ofrelatively large diameter, the head 8a provides a sufiiciently largesupport and superficial area so that the weight of the mold supported onthe table 13 causes such frictional Contact as will hold the table inthe position it has assumed when it engages the mold. I'he one piecetableL 13 has three bearings orkmold supportingpoints or surfaces 5a.

I wish it understood, however, that I do not limit myself to the numberof bearing points 5 or 5?, that is, the number of points adapted toengage the mold.

In both forms of the invention, the connection between thetable and itssupport, is of the nature of a ball and socket joint, constituting afriction lock which holds the table where set when the mold rests on thetable, as the center of gravity is about central with the said ball andsocket support.

-Iaving thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. A self-locking leveling drawing table comprising a plurality ofrelatively movable connected mold-supporting sections,

and a supportcommon to said sections, with 1 which said sectionscollectively engage.

2. A selflocking leveling drawing table comprising a plurality of`relatively movable connected mold supporting sections collectivelyprovided with a cavity, and a rounded support, commonto said sections,said support being received in said cavity and said sectionsfrictionally engaging said sup- 3..A self-loclring leveling drawingtable comprising a pair of table sections hinged together, and a supportwith which said sections collectively engage.

4. A self-locking leveling drawing table comprising mold-supportingsections, loosely articulated together, and a support, common to saidsections, with which they collectively engage.

5. A self-locking leveling drawing table comprising relatively movablesections, a loose connection betweenvr the innerA end portions of thesections, and a frictional support, common to the innervend portions ofsaid sections.

. 6. A self-locking leveling drawing ktable comprising relativelymovablesections having` cavities in their inner end portions, a looseconnection between theinner end portions of the sections, and a roundedsupport received in the cavities aforesaid, with which said sectionsfrictionally engage.

Y In testimony-whereof, I hereunto afHX my signature.

WILLIAM C. NORCROSS. y

Copies of this patent may be obtained for five cents each,- byaddressing the Commissioner of Patents, Washington, D. G.

